Question

1-2+3-4+5-6+L-100+101=______．

Answer 1

1-2+3-4+5-6+L-100+101
=（1-2）+（3-4）+（5-6）+L+101
=-1+（-1）+（-1）+L+101
=-50+101
=51
故答案為：51．